Biologia reprodutiva de Ligia exotica (Crustacea, Isopoda, Ligiidae) em Rio Grande, Rio Grande do Sul, Brasil

Lopes, Elis Regina de Carvalho; Blasina, Juliana Ruas; Dumont, Luiz Felipe Cestari; D’Incao, Fernando

doi:10.1590/s0073-47212006000100001

“…Once in a new harbor, the availability of rocky habitat, similar temperatures to source localities, and high reproductive rates would have contributed to their successful establishment. Indeed, high reproductive rates have been reported for L. exotica in an introduced Brazilian population ( Lopes et al, 2006 ).…”

Section: Discussionmentioning

confidence: 99%

Out of Asia: mitochondrial evolutionary history of the globally introduced supralittoral isopodLigia exotica

Hurtado

¹

,

Mateos

²

,

Wang

³

et al. 2018

PeerJ

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The native ranges and invasion histories of many marine species remain elusive due to a dynamic dispersal process via marine vessels. Molecular markers can aid in identification of native ranges and elucidation of the introduction and establishment process. The supralittoral isopod Ligia exotica has a wide tropical and subtropical distribution, frequently found in harbors and ports around the globe. This isopod is hypothesized to have an Old World origin, from where it was unintentionally introduced to other regions via wooden ships and solid ballast. Its native range, however, remains uncertain. Recent molecular studies uncovered the presence of two highly divergent lineages of L. exotica in East Asia, and suggest this region is a source of nonindigenous populations. In this study, we conducted phylogenetic analyses (Maximum Likelihood and Bayesian) of a fragment of the mitochondrial 16S ribosomal (r)DNA gene using a dataset of this isopod that greatly expanded previous representation from Asia and putative nonindigenous populations around the world. For a subset of samples, sequences of 12S rDNA and NaK were also obtained and analyzed together with 16S rDNA. Our results show that L. exotica is comprised of several highly divergent genetic lineages, which probably represent different species. Most of the 16S rDNA genetic diversity (48 haplotypes) was detected in East and Southeast Asia. Only seven haplotypes were observed outside this region (in the Americas, Hawai’i, Africa and India), which were identical or closely related to haplotypes found in East and Southeast Asia. Phylogenetic patterns indicate the L. exotica clade originated and diversified in East and Southeast Asia, and only members of one of the divergent lineages have spread out of this region, recently, suggesting the potential to become invasive is phylogenetically constrained.

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“…Further evidence of a better suitability of individuals inhabiting the West Breakwater is provided by fecundity analysis. Previous investigation suggests that fecundity of females inhabiting West Breakwater is significantly higher than that observed for Leonideo Island (Lopes et al , 2006).…”

Section: Discussionmentioning

confidence: 79%

“…Investigations regarding the population dynamics of L. exotica have focused on the reproductive process, particularly on the comparison of reproductive strategies of inland and littoral zone populations (Tsai & Dai, 2001), and on the comparison of reproductive traits of co-generic species (Tsai & Chen, 1997). For the Brazilian southern coast, two studies have addressed the reproductive biology of L. exotica in two different estuaries (Souza, 1998; Lopes et al , 2006). Concerning individual growth, no information is available, and the VBGM has not been attempted to describe the growth of L. exotica .…”

Section: Introductionmentioning

confidence: 99%

Growth ofLigia exotica(Isopoda: Oniscidea: Ligiidae) in two estuarine regions of Patos Lagoon, Rio Grande do Sul, Brazil

Lopes-Leitzke

¹

,

Dumont

²

,

D’Incao

³

2009

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Growth of Ligia exotica (Isopoda: Oniscidea: Ligiidae) in two estuarine regions of Patos Lagoon, Rio Grande do Sul, Brazil elis r. lopes-leitzke, luiz f.c. dumont and fernando d'incao FURG, Laboratório de Crustáceos Decápodos, Instituto de Oceanografia, CP: 474, CEP: 96201-900, Rio Grande, RS, BrazilThe aim of this study was to estimate growth parameters of two populations of Ligia exotica inhabiting discrete estuarine areas of Patos Lagoon, Rio Grande do Sul, Brazil. Sampling was performed fortnightly at two different estuarine zones, named Leonideo Island and West Breakwater, to detect different growth patterns for this species by using the von Bertalanffy growth model (VBGM). The VBGM estimated were as follows: TL mm ¼ 34.57 (1 2 e 20.012(t 2 2.93) ) (males in Leonideo Island), TL mm ¼ 35.61(1 2 e 20.009(t 2 5.87) ) (males in West Breakwater), TL mm ¼ 30.11(1 2 e 20.009(t 2 5.84) ) (females in Leonideo Island) and TL mm ¼ 29.65(1 2 e 20.01(t 2 4.87) ). Significant sexual dimorphism was observed, since males reach larger TL (mm) by higher k value (day) and consequently a faster growth pattern. Different growth patterns of males were also detected comparing both populations, in such a way that the West Breakwater individuals are larger than those from the Leonideo Island. One possible explanation is the higher food availability observed in the former site, as well as favourable environmental parameters, providing better conditions for individual growth. Briefly, two different populations of L. exotica were detected in the studied area, presenting discrete growth parameters highly influenced by environmental factors.

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“…Once in a new harbor, the availability of rocky habitat, similar temperatures to source localities, and high reproductive rates would have contributed to their successful establishment. Indeed, high reproductive rates have been reported for L. exotica in an introduced Brazilian population (Lopes et al, 2006). in East and Southeast Asia, than in the other regions surveyed (Americas, Hawai'i, Africa and India), where only seven 16S rDNA haplotypes were detected; which were identical or very closely related to haplotypes from East and Southeast Asia.…”

Section: Evolution Of 'Invasiveness'mentioning

confidence: 85%

Out of Asia: Mitochondrial evolutionary history of the globally introduced supralittoral isopod Ligia exotica

Hurtado

¹

,

Mateos

²

,

Wang

³

et al. 2017

Preprint

View full text Add to dashboard Cite

The native ranges and invasion histories of many marine species remain elusive due to a dynamic dispersal process via marine vessels. Molecular markers can aid in identification of native ranges and elucidation of the introduction and establishment process. The supralittoral isopod Ligia exotica has a wide tropical and subtropical distribution, frequently found in harbors and ports around the globe. This isopod is hypothesized to have an Old World origin, from where it was unintentionally introduced to other regions via wooden ships and solid ballast. Its native range, however, remains uncertain. Recent molecular studies uncovered the presence of two highly divergent lineages of L. exotica in East Asia, and suggest this region is a source of nonindigenous populations. In this study, we conducted phylogenetic analyses (Maximum Likelihood and Bayesian) of a fragment of the mitochondrial 16S ribosomal (r)DNA gene using a dataset of this isopod that greatly expanded previous representation from Asia and putative nonindigenous populations around the world. For a subset of samples, sequences of 12S rDNA and NaK were also obtained and analyzed together with 16S rDNA. Our results show that L. exotica is comprised of several highly divergent genetic lineages, which probably represent different species. Most of the 16S rDNA genetic diversity (48 haplotypes) was detected in East and Southeast Asia. Only seven haplotypes were observed outside this region (in the Americas, Hawai’i, Africa and India), which were identical or closely related to haplotypes found in East and Southeast Asia. Phylogenetic patterns indicate the L. exotica clade originated and diversified in East and Southeast Asia, and only members of one of the divergent lineages have spread out of this region, recently, suggesting the potential to become invasive is phylogenetically constrained.

show abstract

Biologia reprodutiva de Ligia exotica (Crustacea, Isopoda, Ligiidae) em Rio Grande, Rio Grande do Sul, Brasil

Cited by 6 publications

References 14 publications

Out of Asia: mitochondrial evolutionary history of the globally introduced supralittoral isopodLigia exotica

Out of Asia: mitochondrial evolutionary history of the globally introduced supralittoral isopodLigia exotica

Growth ofLigia exotica(Isopoda: Oniscidea: Ligiidae) in two estuarine regions of Patos Lagoon, Rio Grande do Sul, Brazil

Out of Asia: Mitochondrial evolutionary history of the globally introduced supralittoral isopod Ligia exotica

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